At the same time, a subtle but powerful new spirit was rising in Europe. It was virulently subversive of all medieval society, especially the Church, though no one recognized it as such, partly because its greatest figures were devout Catholics. During the pontificate of Innocent III (1198–1216) the rediscovery of Aristotelian learning—in dialectic, logic, natural science, and metaphysics—had been readily synthesized with traditional Church doctrine. Now, as the full cultural heritage of Greece and Rome began to reappear, the problems of synthesis were escalating, and they defied solution. In
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